Covington's newest addition to the Ultimate Sintered Diamond Wheel line are these 4" x 1/4" engraving wheels. A great accompaniment to any grinding lathe, these industrial wheels are perfect for carving stones and glass. Even diamond distribution and balance make these wheels the best on the market! Each wheel has a 1" arbor hole and is available in a circle/round rim, point/v rim, or flat/square rim.